package com.bwie.white;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.util.StringUtils;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.concurrent.TimeUnit;

@Configuration
public class White implements GlobalFilter, Ordered {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        String[] allUser = new String[]{"/user/login","/user/code/","/list/upload"};
        String s = request.getPath().toString();

        for (int i=0; i<allUser.length; i++){
            if (s.contains(allUser[i])){
              return chain.filter(exchange);
            }
        }

        String token = request.getHeaders().getFirst("token");
        if (StringUtils.isEmpty(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }else {
            Claims body = Jwts.parser().setSigningKey("bwie").parseClaimsJws(token).getBody();
            Integer uid = body.get("uid", Integer.class);
            String redisToken = stringRedisTemplate.opsForValue().get("token" + uid);
            if (StringUtils.isEmpty(redisToken)){
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }else {
                if (!token.equals(redisToken)){
                    response.setStatusCode(HttpStatus.UNAUTHORIZED);
                    return response.setComplete();
                }

                Long expire = stringRedisTemplate.getExpire("token" + uid);
                if (expire<0){
                    stringRedisTemplate.opsForValue().set("token"+uid,redisToken,15, TimeUnit.MINUTES);
                }

            }
        }

        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
